最佳答案:useful
最佳答案:不会
最佳答案:You are all useful people.
最佳答案:You are a useful man.
最佳答案:春 spring夏 summer秋 autumn/fall冬 winte
最佳答案:I know a useful means of transport满意请采纳
最佳答案:My math teacher says math is very useful
最佳答案:Everyone needs friends.A friend can give us help and share our difficulties and